The problems posed by zero gravity can make it harder for space shuttle crews, especially rookies, to get things done. That's no small matter now that shuttle missions are jammed with so much work that the astronauts have little time for sleep and meals.

This weekend as the seven astronauts relax before Tuesday's blastoff into space, the beer will be cold and waiting at crew quarters at Kennedy Space Center. No one will monitor how much they drink, no breath tests given.

This weekend as the seven astronauts relax before Tuesday's blastoff into space, the beer will be cold and waiting at crew quarters at Kennedy Space Center. No one will monitor how much they drink, no breath tests given.